无法创建虚拟网络

执行建立虚拟网络命令
[root@openstack nova]# nova network-create vmnet --fixed-range-v4=192.168.3.0/24 --bridge-interface=br1 --multi-host=T
ERROR: The server has either erred or is incapable of performing the requested operation. (HTTP 500) (Request-ID: req-17ea0238-2d3c-4185-a780-912981433993)
[root@openstack nova]#
在nova的api.log中：
[root@openstack nova]# cat api.log

2015-05-10 07:15:32.907 1834 ERROR nova.api.openstack [req-17ea0238-2d3c-4185-a780-912981433993 05c854ca4fd34193b166435d26c51e7f aff4c6aaca2d4edf9210d5b94d07fd98] Caught error: 'module' object has no attribute 'call'
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack Traceback (most recent call last):
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/api/openstack/__init__.py", line 119, in __call__
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return req.get_response(self.application)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/webob/request.py", line 1296, in send
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     application, catch_exc_info=False)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/webob/request.py", line 1260, in call_application
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     app_iter = application(self.environ, start_response)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/webob/dec.py", line 144, in __call__
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return resp(environ, start_response)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/keystoneclient/middleware/auth_token.py", line 582, in __call__
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return self.app(env, start_response)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/webob/dec.py", line 144, in __call__
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return resp(environ, start_response)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/webob/dec.py", line 144, in __call__
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return resp(environ, start_response)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/Routes-1.12.3-py2.6.egg/routes/middleware.py", line 131, in __call__
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     response = self.app(environ, start_response)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/webob/dec.py", line 144, in __call__
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return resp(environ, start_response)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/webob/dec.py", line 130, in __call__
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     resp = self.call_func(req, *args, **self.kwargs)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/webob/dec.py", line 195, in call_func
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return self.func(req, *args, **kwargs)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/api/openstack/wsgi.py", line 938, in __call__
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     content_type, body, accept)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/api/openstack/wsgi.py", line 997, in _process_stack
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     action_result = self.dispatch(meth, request, action_args)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/api/openstack/wsgi.py", line 1078, in dispatch
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return method(req=request, **action_args)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/api/openstack/compute/contrib/os_networks.py", line 126, in create
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     network = self.network_api.create(context, **params)[0]
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/network/api.py", line 96, in wrapped
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return func(self, context, *args, **kwargs)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/network/api.py", line 145, in create
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return self.network_rpcapi.create_networks(context, **kwargs)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/network/rpcapi.py", line 102, in create_networks
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return self.client.call(ctxt, 'create_networks', **kwargs)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/rpcclient.py", line 85, in call
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return self._invoke(self.proxy.call, ctxt, method, **kwargs)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/rpcclient.py", line 63, in _invoke
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return cast_or_call(ctxt, msg, **self.kwargs)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/openstack/common/rpc/proxy.py", line 126, in call
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     result = rpc.call(context, real_topic, msg, timeout)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack   File "/usr/lib/python2.6/site-packages/nova/openstack/common/rpc/__init__.py", line 139, in call
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack     return _get_impl().call(CONF, context, topic, msg, timeout)
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack AttributeError: 'module' object has no attribute 'call'
2015-05-10 07:15:32.907 1834 TRACE nova.api.openstack
[root@openstack nova]#